It is important to let people know that you appreciate the things they do for you, no matter how major or how minor it may be. That is why it is so important to buy thank you cards to send out to people regardless of the occasion. Whether someone has helped you out with a school project, given you a gift for your birthday, or even just gave you a great piece of advice, there is no better way to show how much it meant to you than with a nice thank you card.
When you buy thank you cards you are making the decision to stay connected with the people who have helped you in some way, and in a sense you are ensuring that they will be there for you in the future as well. It is important though, that you do not just give out thank you cards and never return favors, as you need to practice what you preach. If you can do that then the next thing you know you will be receiving some thank you cards of your own from all of your friends and family.
Sometimes it seems pointless to buy thank you cards when it is so simple to just call someone up and say thank you. However, people love to get a little note or card because it shows that you took a little time out of your day to think of them and say thanks, so buy thank you cards today and give that feeling to someone you've been meaning to thank.